Which scenario most clearly contraindicates live vaccines such as MMR or varicella?

Which scenario most clearly contraindicates live vaccines such as MMR or varicella?

• A. Healthy adult
• B. Patient undergoing chemotherapy
• C. Teenager with a mild cold
• D. Person on stable meds for acne

Answer: (B)

Live vaccines use attenuated organisms that can replicate in the body. They work well when the immune system is intact, but in people with suppressed immunity, such replication can cause disease rather than prevent it. Chemotherapy profoundly weakens the immune system, reducing the body's ability to control the live vaccine strains, so giving a live vaccine like MMR or varicella is contraindicated in that scenario. A healthy adult can receive these vaccines when not contraindicated, a mild cold does not usually prevent vaccination, and stable acne medications don’t impair immune function, so none of those scenarios pose the same risk.

Live vaccines use attenuated organisms that can replicate in the body. They work well when the immune system is intact, but in people with suppressed immunity, such replication can cause disease rather than prevent it. Chemotherapy profoundly weakens the immune system, reducing the body's ability to control the live vaccine strains, so giving a live vaccine like MMR or varicella is contraindicated in that scenario.

A healthy adult can receive these vaccines when not contraindicated, a mild cold does not usually prevent vaccination, and stable acne medications don’t impair immune function, so none of those scenarios pose the same risk.